Join Date: Oct 2012
Location: Clarence, NY- Buffalo suburbs
05-06 L61 and LSJ's have Gen 1 blocks, all LE5, LNF, LAP's and 07-08 L61's are Gen 2 blocks. Essentially the sleeves are much stronger and coolant was added, gen 3 is much better than the previous two which either on a built engine I'd recommend sleeves (Mr. B on CSS).
L61's and LSJ's have regular DOHC cams (not the same head) where LE5's and LAP's share the same VVT on a DOHC head and the LNF has a different VVT head.
LSJ's are typically limited by their stock sleeves to around 400 to the wheels before stuff brakes but a bad tune will destroy it earlier, they hate detonation and will crack sleeves especially on a meth setup when the meth fails (most common failure). LNF's are limited by their rods to about 550-600 WHP but it's not too uncommon to see pistons go with a bad tune. The LE5 in 06-07 was forged and the most anyone's pushed them too was 406 WHP 47x wheel torque (forget exact torque number but it was in the 470's). L61's later than 07 LE5's and LAP's are known to go around 250-260 WHP/TQ by the little rods.
The most important thing at any power level is the tune, a bad one can destroy an engine at a much lower HP than normal.
2009 Cobalt LS XFE (F23) Victory Red
YYZ V.3 Springs, Koni shocks/struts, Powell XXX rear swaybar, Brembo brake swap, 5 lug conversion, Ion Redline wheels, SS/SC interior swap including power conversion, K&N intake, Trifecta tune, Ark Performance N-II catback, Ark shorty antenna, SS body kit, Powell F23 rotated mount, LNF rear mount, Powell CABs
Soon to come- EFR 6758 turbo kit and make Retro Headlights.